Temperature effect on the extraction of lanthanides in the TBP-HNO3 system

Geochemical behaviour of lanthanoid elements in some clays and bauxite.

“…In analogy with the difference in ion exchange properties described by FIDELIS (1970), and FIDELIS and SIEKIERSKI (1965, 1966, 1967, we suggested that orbital splitting and crystal field relations influence the distributions of the lanthanoid elements between minerals under a wide variety of geologic conditions (ROALDSET and CHRISTIE, 1975).…”

Rare Earths in Alaska: Proceedings of Office of the Governor's Alaska Science and Engineering Advisory Commission Symposium, held Aug. 17-18, 1988, in Fairbanks, Alaska

“…The important parameters in all these liquid-liquid separations are the distribution coefficients and the resulting separation factors of adjacent rare earths. The distribution coefficient changes with temperature (Fidelis 1970;Fidelis 1971). If the plant were located where temperature gradients are extreme, it would severely affect separation if the plant were not kept at the same temperature all year.…”

Synergistic extraction of neodymium and carrier-free promethium by the mixture of HDEHP and PC88A

“…[2][3][4] CECCAROLI et al 5 measured separation factors 2.5-3.05-7 for the lanthanides using HDEHP and ammonium thiocyanate as organic and aqueous phase, respectively. FtOELIS et al 8 reported the LLX studies of 147pm and 147Nd isotopes in undiluted TBP from HNO 3 solution and reported a 1.8 separation factor between the Nd-Pm pair, which is till date the highest reported separation factor for this pair. 8 Use of synergistic agent for improvement of separation factor has been done with mixtures of chelating agents and neutral donors like TOPO, TBP, etc.…”

“…FtOELIS et al 8 reported the LLX studies of 147pm and 147Nd isotopes in undiluted TBP from HNO 3 solution and reported a 1.8 separation factor between the Nd-Pm pair, which is till date the highest reported separation factor for this pair. 8 Use of synergistic agent for improvement of separation factor has been done with mixtures of chelating agents and neutral donors like TOPO, TBP, etc. 9-13 However, the use of the mixture of HDEHP and PC88A (2-ethylhexylphosphonic acid mono-2-ethylhexyl ester) as synergistic agent has yet not been reported.…”